Vibro-Meter TQ402 111-402-000-012 Non-contact Proximity Transducer

Parameter
Model: TQ402 111-402-000-012 Non-contact Proximity Transducer
Frequency response: DC to 20 kHz (−3 dB)
Measurement range: 2 or 4 mm
Temperature range: −40 to +180 °C
Sensitivity (System Output): 8.0 V/mm (200 mV/mil)
Interchangeability Error: ≤ ±5%
System Output Voltage (at Gap): --2 V to -18 V DC (typically centered around -10 V DC)

Description

The Vibro-Meter TQ402 111-402-000-012 is a non-contact proximity transducer designed for accurate measurement of shaft relative vibration, axial position, and gap in rotating machinery. Operating on the eddy-current principle, it is used with the EA402 extension cable and IQS900 signal conditioner to form a complete proximity measurement system. The transducer features a stainless-steel body, a durable Torlon® sensing tip, and an integral coaxial cable, providing reliable performance with a frequency response from DC to 20 kHz. It is suitable for continuous machinery monitoring applications, including steam turbines, gas turbines, hydraulic turbines, compressors, pumps, and generators. 

Frequently asked questions

Q:What is the Vibro-Meter TQ402 111-402-000-012?
A:The Vibro-Meter TQ402 111-402-000-012 is a non-contact proximity transducer designed to measure shaft relative vibration, axial position, and gap in rotating machinery. It is used with the EA402 extension cable and IQS900 signal conditioner as a complete proximity measurement system.

Q:What measurement principle does the TQ402 use?
A:The TQ402 operates on the eddy-current measurement principle, providing accurate, contactless measurement of the displacement of conductive machine components.

Q:What applications is the TQ402 suitable for?

A:The TQ402 is suitable for monitoring shaft relative vibration, shaft position, and gap in steam turbines, gas turbines, hydraulic turbines, compressors, pumps, generators, and other rotating machinery. It also conforms to API 670 recommendations.

Application areas

The Vibro-Meter TQ402 111-402-000-012 is engineered for high-precision, non-contact measurement of critical shaft dynamics.The primary application areas for this specific model include:

• Axial Thrust Position (Thrust Gap): Mounted axially against the shaft thrust collar to track microscopic steady-state axial shifting, protecting the machine from axial rotor-to-stator rubbing caused by thermal expansion or load changes.
• Centrifugal & Axial Compressor Protection: Installed directly inside the high-speed bearing housings of air compressors or pipeline booster loops to detect oil film whip, subsynchronous whirl, and sudden unbalances.
• Main Shaft Runout Monitoring: Deployed on the guide bearings of massive Francis, Kaplan, or Pelton vertical turbines to monitor shaft eccentricity and tilt under enormous water load fluctuations.

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